Preparation method of La2O3-doped Mo negative electrode material for magnetron

The invention relates to a preparation method of a La2O3-doped Mo negative electrode material for a magnetron, and belongs to the technical field of a rare-earth refractory metal negative electrode. A rare-earth active substance La2O3 is doped in a Mo substrate, the addition total amount of the rare-earth active substance accounts for 2.0-5.0wt%, and the balance is Mo. The preparation method comprises the steps of preparing La2O3-doped MoO3 powder by liquid-liquid doping sol-gel method, and preparing a La2O3-doped Mo rod by reduction, compression and sintering processes on oxide powder; performing spin-calcining, drawing, annealing, filament washing, winding, shaping and cutting processes on the Mo rod to obtain an uncarbonated La2O3-doped Mo negative electrode for the magnetron; performing a high-temperature instantaneous carbonization process on the negative electrode to obtain a La2O3-doped Mo filament negative electrode material with high carbonization degree for the magnetron; and performing a high-tempe